Centrifugal pump



.0. v. KERR.

CENTRIFUGAL PUMP.

APPLICATION FILED DECZZ. 1919.V

UNITED vSTATESv PATENT jcrimen.,

y i cHAnLEs v. KEER, or AURORA, I:Li,11\o1sA Assrelvoa 'ro '.I'HnVWORKS, OFAURORAILLINOIKS, A CORPORATION 0F ILLINOIS.

CENTRIFUGAL 'PUMR Specification of Letters'lPatent.

rammed Apr. 12, 1921.

Original application led September 10, 1917, Serial No. 190,524.,Divided and'this appucatin med December 22, 1919.

To aZZwwm it may concern: i'

Be it known that I, CHARLns V. KERR, a

citizen of the United States, -residing 4at Aurora, in the county ofKane and State of Illinois, have invented certain new and usefulImprovements Vin Centrifugal Pumps, of which the following is aspecification.

AIhis invention relates to :centrifugal pumps in general and has for its'salient objects to simplify the 'construction' of the casing andimpeller and more particularly with reference to single impeller pumps;

The invention also is an improvement invk the construction described andclaimed in my earlier Patent No.y 1,129,038, 'granted Februaryl, 1915.

In the accompanying one sheet of drawing, I vhave illustrated certainpreferred Vconstructions whichembody the invention,

similar reference characters indicating the same parts throughout theseverall figures i' of the drawings. Y

The-invention will be .hereinafter vmore fully and clearly described,and particu'- larly pointed out in the appendedclaims.

vIn the drawings: f Figure 1, is a longitudinal section of a centrifugalpump; and' y 1 Fig. 2, is' a composite view, the right hand half ofwhich represents a partial section on the line a-a of Fig. 1, and theleft hand half of the figure representing a partial section on the line-b of Fig. 1. p l Referring to the drawings, 10 is a casing providedwith an annular discharge chamber 11, preferably in the form of avolute, the outlet from which is at 12. On one side of they chamber 11is a Asuction chamber which is also preferably in the form of a volutewith the intake at 14.` The casing 10 is supported by legs 15, 16 and17, which are suitably braced by the webs 18 and 19. Above thev leg 17is a bearing 20, of any suitable construction, but preferably of thering-oiling type, illustrated. On the opposite side of the chamber 11,from the chamber 13, the casinghas a removable cover or side plate 21which is boltedtd the casing proper, and a tight joint formedtherebetween `by means of packing 22. The plate 21 has a bracket 23which carries a bearing 24, similar to the bearing 20. A shaft 25 ismounted in the bearings 20,

- ing maintained between of the impeller.

Serial No. 346,610;

y which ,abut'the endsof the 'impellr hub and are respectively securedto theshaftb' the threaded connections 30r land 31.

AMERICAN VITELI..Y

numeral 27 is keyed on stuiing-box 32 ofthe usualy constructionis. y

arranged in the wall 33 ofthe chamber and prevents leakage'y along Vthe*surface of sleeve 28. A similar stuiiing-box 34 is arranged yin -theplate 21 and prevents leakagefalong the surface'of sleeve 29. 1 l

The casing 10 has an annular recessl forthe wearing ring 52, a groundjoint` bethe ring and 'casing on the surface 53 and the Aring beingseated Vbythe discharge pressure jacting on its inner surfaces.Theinterior of the ring 52 is stepped tovcoirrespond to the steppedarrangement of the surfaces 47, 48, 49 and 50 n The "construction,however, 1s such that the surface 47 will contact withthe opposingsurface of thering 52 and prevent the .surfacelv 48 from contacting withthe surface opposed thereto. This stepped formation ofthe impeller andofV l the ring 52 provides-a tortuous passage through which smallquantities fof A water may flow from the discharge chamberll to thesuction chamber 13, this'water forming a .fluid packing which reduces'wear to af minimumand cushions endwise movements of the impeller. `Onthe other side of the impellera similar ring 54 is provided, this Y,ring seating ina recess'55inthe plate 21 l Y and having a stepped'interior to'correspond to the stepped arrangement' ofthe surfaces 40,41, 42'and 43 of the impeller. As in the case of the ring 52, the innersurface A40 will contact with Vthe opposing surface ofv the ring 54 andprevent the surface 41 from contacting with the surface of the ringopposed thereto. These rings 52 and 54 are given a radial clearance incasing 10k and plate 21 to permit self-centering with the` `impeller 27as the shaft 25 sinks in consequence of .wear in thebearings 20 and 24,-Y

whereby leakage backward from discharge to suction chambers is reduced.

When the pump-is in operation the water isdrawn from chamber=13 anddischarged vzo Yinto chamber 11, as is well known. The

pressure in chamber 11 forces water through the tortuous passages. onthe interior of the rings 52 and 54. VThe collars 56 and 57 are set forbearing contact by Y means of set Vscrews or otherwise to permit a.

the surfaces, 40 and 47V of the impeller to vContact simultaneously withthe opposing water. permittedthisfzresulting in a reduction of thepressure on the surfaces l47 and V48 and an increase of the pressure .onthe surface41, thereby equalizing the end pressure k0n the impeller.Ifthe excessofpressure -istoward the left the operations will bereversed'.v n .f Y

` In order to substantially balance vthe pressures-onA the impeller, aleakage chamber 58 is provided i-n the plate 21vand communication withthe suction chamber ,13 established by means of a pipe 59, or by acored.passage around., the .discharge4 chamber 11. The centralV portions ofboth sides of the impeller are thus subjected to the suction pressure. Yv

' I'doiiot herein claim the speci'lic'construction of the 'impeller as'this-'is the subjectV matter ofja separate `and independent' ap#lication-.liled by Ime SeptemberlO, 1917, gerialNumber 190,524, andpatented April v2O, 1920,Number1,337,6 59, of Which'the 'presentapplication-is a division.l 'l

. What I claim, is 1. Ina centrifugal pump, the combinationrwithacasing, of a rotary `impeller lhaving annular flanges at each end, said casing Vhaving cylindrical shoulders spaced from said impellerflanges, and floating annular membersfcoacting with vsaid flanges andperipherally.shouldered to coact with :said

Vshoulders on said casing, as specified.

2. In a .centrifugalvpiimp, the combina- Y tion with agcasing, ofV arotary impeller having annular portions at each end, said casing havingsurrounding annularportions spaced from the annular portions of said im-Y eller and floatinor annular members dis-V posedbetween said annularportions on said easing and impeller to coact with both, for

the purpose specified.

3..In a centrifugal pump, the combination witha casing,'of a rotaryVimpeller-having an :annular portion, said casing having a surroundingportion spaced from the annular portion of said impeller,`1and afloating.annular member disposed between said Y annularV portions on said casingand im-l peller toV coact with both, forthe purpose 4.-In a .centrifugalpump., Ythe combi-nationl of a casing having a .suction `chamber andardischarge chamber, a rotary `impeller mounted 1in said casing, and*rings carried by `vthe'walls of the-casingat the ends'l'of `thejimpell'er-and having interior parts which co operate withycorresponding outer Vwalls of vthe impeller to provide' Vpassagesthrough `which water 'may flow from said discharge chamber, saidringsfhaving radial .clearance in said casing to permitself-centeringfw-itli said Yin'ipeller and being seated by differenceVofspressure between suction and discharge chambers and said partsconstructed-and Larranged 'tobe adapted to meetand close the passagesValternately on the two sides of the impeller, whereby the fluidApressure l*in the discharge chamber will yact in the passageV sofelosedand equalize the axial' pressures on the impeller. Y .Y

` 5. In a centrifugal pump, `,the combination of a casinghavinga suctionand a :discharge chamber, anV impeller rotatively mountedpin saidcasing, a wearing ring having :radialclearance coperating with saidimpeller and'seated by pressure'in the casling on each side of saidimpeller, and self- 'centering' therewith for reducing leakage, a

leakage chamberin saidcasing axially opposite said suctionchambei' and`means connecting said leakage and'.v suction chambers for equalizingfluid pressure in said chambers. Y .f Y A In testimony whereof IV affixmy signature.

cHARLEsv. keine.'

